I think that his character had potential, but it was wasted somewhat; I mean, look at Knuckles. He used to be the numero uno Sonic rival (with the possible exception of Metal Sonic), but after the Adventure games he basically became Tails II. Shadow is looking more and more like going the same way, unfortunately; I haven't seen enough of Silver to judge his transformation; Blaze somewhat works in her current role, but also, like Shadow, has a lot of potential that could be used (really liked how she was portrayed in Sonic Rush); and even Metal Sonic did a heroic deed in Sonic Rivals 2, though one could interpret that as Eggman forcing him to.
Anyway, I find wall jumping satisfying because I know I'll never be able to do it in real life and that sheer moment of awesomeness is as close as I'll ever get to the real thing. \=|